I used to have a similar junk-selling addon too. Except that no one seemed to support it, and it was about 5 patches out of date. But it still worked...

I wrote Junk selling into Watto because 1) I wanted updated support for a junk selling program, 2) none of the ones I could find (that worked) had exceptions of the exceptions list. Watto does. 3) I didn't feel like changing other people's code to make it work the way I wanted. It felt like a violation. And finally, and most significantly, 4) I wanted to lower the memory/power usage by merging it with another very useful addon.

I believe Watto to be better than other junk selling addons, simply because it also has the functionality of mass buying built into it.

But if you're very determined not to use Watto's selling function, I suppose you could comment out the button's XML data. That should hide it, effectively removing it's selling functionality.

But I'd perfer it if you didn't, and at least give Watto's junk selling functions a try. Who knows? You might find out you like Watto's junk selling better.